Reversible dipper tooth



L. W. VAN BUS KIRK AND P. W. PORTER. REVERSIBLE DIPPER TOOTH. APPLICATION FILED APR.26, I921. lflss fll. Patented Dec. 5,1922.

2 SHEETSSHEET 1.

WM JD) 14 Q a/ 26W.

alike-z wag L. W. VAN BUSKIRK AND P. W. PORTER.

REVERSIBLE DIPPER TOOTH. APPLICATION FILED APR.26. 1921.

1,438,001 Patented Dec. 5, 1922.

2 SHEETS-SHEET 2.

Patented Dec. 5,' 1922. 1,438,001

ATENT OFFICE.

- LESHER W. VAN BUSKIRK AND PHILIP W. PORTER, OF HIGH BRIDGE, NEW JERSEY, ASSIGNORS TO TAYLOR-WHARTON IRON ANDSTEEL COMPANY, OF HIGH BRIDGE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

REVERSIBLE DIIPIER TOOTH.

Application filed Apai1 26, 1921. Serial No. 464,647.

To all whom it may concern: to accommodate the bucket, and with holes3 Be it known that we, LESHER W. VAN to provide for the usual rivet connection. BUSKIRK and PHILIP W. PORTER, citizens of Its frontal part or nose is bifurcated, as is I the United States, and residents of High usual, to provide spaced point-receiving 5 Bridge, in the county of Hunterdon and arms or elements 4 of approximately tri- State of New Jersey, have jointly invented angular outline in side elevation, the junccertain new and useful Improvements in Reture of the arms with the base proper preversible Dipper Teeth, of which the followsenting perpendicular abutments or shouling is a specification, reference being made ders 5 to be later more specifically referred 60 to the accompanying drawings, forming a Eilch I terminates n a tip 6 ith the parthereof upper and lower walls 7 and 8.divergent The most serviceable forms of digging therefrom to a point in advance ofthe shoulteeth or so-called dipper teeth are those in ders 5 where said walls 7 and 8' are approxiwhich the bucket carried element and point mately parallel as at 9. The top and bote5 are constructed in one piece, but of late om walls of arms 4 are also outwardly inyears the practice has been to make them cl-lned, as'indlcated. at 10 1n Fig. 2, so that f ti l f r h d i a ba d a 1n cr0ss-sect1on they are of general trape-' detachable and reversible point. This type ld 01' wedge f0rmat10n. The throat or is preferred for economical reasons because 0i sep r mg the arms 1S g y flared, 70

th oi t i ubj t d t h v w a d r as indicated at 1 1, to facilitate the introducquires frequent reversal or replacement. t1on 0f the point, and the tips have angular Yet there is considerable dissatisfaction beng surfaces, as lndlcated at 12 in Fig. cause no form of interlock has heretofore to e a P g y formed r been proposed which did not inherently Ses 1n the point. 75 'weaken the base or which was sturdy The point 13 has a central longitudinally enough to maintain the requisite rigidity to glng we 14 adapted to snugly fit the eliminate side wobbling and other forms of space between the point-receiving arms 4, 1 1-, m ti and also functioning to prevent spreading of Objects of our invention are to provide h jaws of the points The web has a 80 a dipper tooth of the sectional form in which urv or -l ll te termlnal WhlCh fits the breakage of the base is wholly eliminated, correspondingly curved crotch portion of the or at any rate reduced to the minimum, and base. Thls materially assists in preventing which will maintain perfect rigidity of the relatlye movement of the point and base. point under all conditions of service. The a-ws and the web form laterally and 85 The invention, generally stated, r id rearwardly openmg notches or recesses 15 i th di t th d i th l t f accurately contoured to accommodate the which it is embodied, all as hereinafter dep01I1trece1ving a-rms 4, so that as the point is scribed and particularly pointed out in the moved to positlon with the web between the claims. arms there is a wedging action or substan- 90 Referring to the drawings, tlally a dovetail connection between the Figure 1 is an elevational view, showing point-recelving arms and their complementhe base and point in assembled relation. tal recesses. The rear portions of the upper Fig. 2 is a section on line 2--2 of Fig. 1. and lower wallsof the dovetail notches 15,

Fig. 3 is a perspective view of the point. are flattened as at 16 to co-operate with the 95 Fig.4 is a longitudinal sectional view of approximately parallel portions 9 of the a modification. I point-receiving arms, thus providing a sub- Fig. 5 is a-section on line 55 of Fig. 4. stantial broad area of bearing to assist in Fig. 6 is an elevational view of a further preventing twisting movement of the point.

modification. The shoulders 5 of the base are in a plane 100 In the preferred construction, the base 1 approximately at right angles to the plane is provided with the usual slot or recess 2 of movement of the tooth in use, and the ends 17 of the point abut squarely against these shoulders and thus take care of some of the end thrust.

The point-receiving arms 4 and the web 1A are provided with registering openings 18 to accommodate a transversely ranging pin or rivet 19 buttonheaded at its respective ends.

In Figs. 4 and 5, there is illustrated a slight modification wherein the web 14 is provided with longitudinally extending ribs or panels 20 and the point-receiving arms 4 are provided with correspondingly grooved or channeled portions 21 with which the ribs co-operate in the assemblage of the parts. Manifestly this construction affords an additional safeguard to twisting or turning movement of the point. Rigidity of the parts is also promoted by the angular dis position of the tips 6 with respect to the extreme limits of the point recesses 15 with which they co-operate.

In Fig. 6, there is shown a further modification in that the shoulders 5 are formed on lines substantialy coincident with a line of curvature of which the apex of the point is the center, such shoulders and similar shoulders' or stops 21 on the point mutually tend to resist end thrust and lateral thrust in a manner obvious from the drawing.

In all constructions, we prefer to employ, as indicated in the drawing, a point having full section jaws and a full section web, that is to say jaws which extend the full width of the point body and an unbroken longitudinal full section web which fully bridges the jaws. The full section jaws are essential to provide for the undercut areas which c0- operate with the reverse bevels of the base. The full section web eliminates spreading or warping and by filling the undercut area of the base, aids materially in uniformly transferring stresses to the base, and afiords cooperative aid in preventing side wobble, twisting movement, and other forms of lost motion. The sectional view of the point clearly indicates that the general design of the reverse bevels, considering the top and bottom sets, respectively, as entities, is that of an arch. The eflect and merit of this is that when the point is applied, the undercut portions of its full section jaws will exert substantial side ing arms.

The improved dipper tooth is thus adapted for ready and convenient reversal, as the cooperating parts are identical in either position, and when assembled there is afforded a substantially unbroken thickness of metal through the point and base, with a transverse pin securing the parts against endwise dis placement. Furthermore, the co-operation of the base and point is through the medium of a relative clamping or sliding co-action, which when at its limit provides opposing pressure on the point-receiv substantially dovetail connections, the effect of which is to eliminate or minimize twisting movement. 1

Having thus described our invention, we claim 1. A reversible point embodying a wedge shape body with full section jaws and a full section vertical web terminating beyond the jaws, said web having an eye near its terminal and having longitudinally extending side bars or panels springing from the crotch of the jaws and stopping short of the eye.

2. A reversible pointembodying a wedge shape body with full section aws and a full section web, the jaws having undercut bevels which are directed laterally.

3. A reversible point embodying a wedge shape body with web connected full section jaws provided with continuous undercut bevels. I

4. A reversible point embodying a wedge shape body with full section jaws and a connecting web, the jaws having opposed laterally directed bevels, and the web having side bars or panels in the longitudinal axial plane of the point.

5. A reversible point embodying a wedge shape body with full section aws and a connecting web, the jaws having continuous laterally directed bevels, and the web terminating beyond the jaws in an arcuate bearing portion.

6. A sectional digging tooth, comprising a base and a point, the base having spaced point receiving arms with point stops perpendicular thereto, the arms having their top and bottom surfaces inclined laterally, and the point having a central web and undercut jaws to frictionally engage the base.

7. A base having a divided forwardly inclined point-receiving portion formed with opposed reversely beveled point engaging surfaces, the bevels being directed laterally.

8. A base having forwardly inclined arms, the inclination stopping short of the base to provide point stops and flat bearing surfaces to resist twisting movement of the point, said arms-having opposed reverse bevels, which are directed laterally.

9. A base having point receiving arms of general trapezoid shape in cross section, their top and bottom surfaces being laterally inclined, said arms having confronting longitudinally extending slots.

10. A sectional digging tooth, comprising a base and a'point, the base having point receivingarms, the top and bottom surfacesof which are inclined laterally, said arms being flared in front and having confronting grooves, and a point having a central web V. v

ceiving arms, the top and bottom surfaces of which are inclined laterally, said arms being flared in front and having confronting grooves, and a point having a central web with side bars or panels adapted to said grooves, and having undercut jaws which operate to press the arms against the web, and auxiliary means for locking the point to the ase.

12. A sectional digging tooth, comprising a base and a point, the base having point receiving arms, the top and bottom surfaces of which are inclined laterally, said arms being flared in front and having confronting grooves, and a point having a central web with side bars or panels adapted to said grooves, and having undercut jaws which operate to press the arms against the web, and a transversely disposed holding pin for securing the point to the base. r I

13. A sectional digging tooth, comprisin a base and a point, the base having space point receiving arms of triangular form in side elevation and with substantially flat and parallel surfaces where they join the base, said arms having their point receiving surfaces inclined laterally, the point havinga central web which fits the space between the arms and having aws-contoured to frictionally engage the arms and operating to exert side thrust upon .the arms sufficient to prevent side motion of the point.

14. A sectional digging; tooth, comprising a point and a base, the ase having pointreceiving arms whereof each is provided with laterally converging point-seating surfaces, and the point having web connected jaws adapted to exert side pressure upon the arms.

15. A sectional digging tooth, comprising a base and a detachable and reversible point, the base having reversely beveled point-receiving arms with the bevel directed laterally, and the point having web connected jaws which clamp said arms.

16. A sectional digging tooth, comprising a base and a reversible point, the base having point-receiving arms and point stops, the latter being formed on a curve of which the center is the apex of the point, and the arms having opposing side directed reversely beveled point seating surfaces, the point having web connected full section jaws which.

straddle the arms with substantial side compression. c

17. A sectional digging tooth, comprising a base and a point, the base having point-m1 ceiving arms the point seating surfaces of which are formed by laterally directed bevels and the point having undercut aws to rigidly grip the arms.

18. A sectional digging tooth, comprising a base and a point, the base having flaring point-receiving arms with confronting grooves, and the point having undercut jaws beveled point-receiving arms, and the point having web connected jaws which are undercut to fit the arms and which exert side pressure on the arms.

21. A sectional digging tooth, comprising a point and a base, the base having a reversely beveled point seating portion, and the point having web connected jaws which are shaped to compressively engage said reversely beveled portion, and positive means for securing the point to the base.

22. A sectional digging tooth, comprising a point and a base, the base having a reversely beveled point seating portion, and the point having web connected jaws with undercut bevels to compressively engage said reversely beveled portion.

23. A sectional digging tooth, comprising a point and a base, the base having a reversely beveled point seating portion, and the point having web connected jaws with continuous undercut bevels to compressively engage said reversely beveled portion.

24. A sectional digging tooth, comprising a point and a base, the base having spaced point receiving arms the top and bottom surfaces of which are reversely beveled, and. the

point having full section jaws which are cor- -full section jaws-the confronting faces of which are continuously undercut to com- -pressibly engage the arms and having a web which fills the space between the arms-and takes a bearing in said undercut portion.

27 A sectional digging tooth, comprising a base and a reversible point, the base having reversely beveled point receiving arms, the point having correspondingly beveled jaws and a central web, the web and arms having transversely ranging pin openings.

- 28. A sectional digging tooth, compr sing a base and a reversible point, the base having point receiving arms with rejversely formed laterally directed bevels and diagonal tips,

and the point having web connected jaws with corresponding reverse bevels and having diagonal notches to receive the tips. 29. A sectional digging tooth of the reversible type, comprising base and point elements whereofone has opposed external reverse bevels and whereof the other has complemental internal bevels, all of said bevels extending laterally, whereby when the elements are assembled lost motion is eliminated 10 by the compressive action of one element upon the other. 3

In testimony whereof we have hereunto signed our names.

LESHER W. VAN BUSKIRK. PHILIP W. PORTER. i 

